docs: def update(self, iterations=1, item_id=None, force_flush=False):
          """
          Updates the progress bar / percentage indicator.
  
          Parameters
          ----------
          iterations : int (default: 1)
              default argument can be changed to integer values
              >=1 in order to update the progress indicators more than once
              per iteration.
          item_id : str (default: None)
              Print an item_id sring behind the progress bar
          force_flush : bool (default: False)
              If True, flushes the progress indicator to the output screen
              in each iteration.
  
          """
          self.item_id = item_id
          self.cnt += iterations
          self._print(force_flush=force_flush)
          self._finish()